Color

#21fd96

#21fd96
hex#21fd96
rgbrgb(33, 253, 150)
hslhsl(152, 98%, 56%)
oklchoklch(0.875 0.211 155.1)
Closest name: mediumspringgreen (#00fa9a)Relative luminance 0.7278

Colors that go with #21fd96

Violet, Deep Sky Blue and Light Coral lead the list. Each partner is a real named colour with the reason it works — a wheel relationship, a neutral that carries it, or a pairing lifted from a palette or brand system that actually shipped — and every pair opens in the palette tool.

Tints & shades

Every swatch is its own page — click any to analyze it.

Harmonies

Complementary

Open in tool →

#fd2187

#21fd28 · #21f5fd

#9621fd · #fd9621

Split-complementary

Open in tool →

#fd21f5 · #fd2821

#2821fd · #fd2187 · #f5fd21

Contrast

#21fd96 as textRatioAAAA largeAAAFix
Aaon white
1.35:1failfailfail
  • AA: use #018849 as the text (4.55:1)
  • AAA: use #016536 as the text (7.2:1)
  • AA: or shift the background to #616161 (4.59:1)
  • AAA: or shift the background to #454545 (7.1:1)
Aaon black
15.56:1passpasspassPasses AAA — no fix needed.

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #21fd96 as the background.

Brands using this color

No public brand in the corpus uses this exact color yet. Extract a brand to add one.

mcpConnect your agent — build around #21fd96
live endpoint

Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — direct_palette, edit_direction, check_palette, check_contrast — read-only, no key. Every direction it proposes comes with a /colors/d/… link: open it, lock what you like, paste the link back, and the agent edits rather than re-rolls.

endpointhttps://mcp.brandsweets.com/colors/mcp
claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt

analyze #21fd96 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/21fd96-a2beb4-d459ce-1f2d2d-e9f1ea?lock=0&style=vibrant

Want the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.

Machine-readable: color.md